what is the kilowatt rating of a three-phase 975-KVA generator at. a.  unity power factor ? b. 80 percent power factor ? c.   50 percent power factor  ?

Q: What is the role of transformers in power systems, and how do they work?

A: Transformers play a critical role in power systems by facilitating the efficient transmission of…

Q: Which type of wind turbine has a higher cut-in speed and lower efficiency? O a. VAWT- drag type O b.…

A: Which type is wind has higher cut in speed and lower efficiency

Q: A short-shunt compound generator delivers a load current of 30 A at 220 V, and has armature,…

A:

Q: A long shunt compound generator has an armature, series field and shunt field resistances of 0.040,…

A:

Q: A cylindrical rotor synchronous generator with constant real power output and constant terminal…

A:

Q: Discuss the role of transformers in power distribution. How do step-up and step-down transformers…

A: Transformers are electrical devices which used to change the voltage levels with constant power and…

Q: 4. Determine the voltage regulation of a 2,000-V, 1-phase alternator giving a current of 100 A at…

A:

Q: Consider the circuit shown in Figure P14.67. a. Determine the values of I1 and V2. b. For each of…

A: Circuit diagram of transformer is given, (a) For the transformer it is given by,

Q: What will be the front and back pitches of the 6-pole dc generator with a simplex 2-layer wave…

A:

Q: Explain the functions of generators and transformers in a power system.

A: Functions of generators and transformers in a power system.

Q: In a three phase cylindrical rotor alternator, the resultant armature reaction MMF behaves like a…

A: Armature reaction in three phase alternator: Armature reaction in any machine is the distortion in…

Q: A.C generator.

A: AC Generator  AC generator is a device that converts mechanical energy given as input to the shaft…

Q: Ih a d.c generator flux is directly proportional to L2 times field current.The generator is working…

A:

Q: speed from full-load to no-load is 2 % in one machine and 3 % in the other; the characteristics…

A: It is given that: Two  50 MVA , 3 phase alternator working in parallel: for machine 1⇒full load to…

Q: What are the disadvantages of low power factor?

A:

Q: Salalah city is planning to install a 3.0 MW wind turbine.

A:

Q: How do transformers work in power distribution, and what are their main applications?

A: Transformers play a crucial role in power distribution systems by facilitating the efficient…

Q: 2. Is it desirable to have leading power factor loads? Why?

A: Obviously, it is always desirable to have a power factor lead so that the power factor of the system…

Q: Discuss the role of transformers in power systems. How do they step up or step down voltage, and…

A: To discuss:the role of transformers in power systems. How do they step up or step down voltage, and…

Q: Two shunt DC generators G1 and G2 are rated at 100 and 150 kW at 110 V respectively. Their external…

A:

Q: Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process…

A:

Q: Discussion:- 1. What do you understand by "armature- reaction"? Discuss the effect of armature…

A: Solve the first question, unless the student has asked for a specific question to be solved, subject…

Q: 3. Determine the efficiency of a 1500 kVA, 2300 V, 3-phase, Y- connected alternator, which operates…

A: Given that       Rating of alternator = 1500 kVA      Voltage V =2300 V 3-ϕ star connected…

Q: How a combined cycle power plant produces balanced output power?

A:

Q: A short shunt compound generator supplies 100A at 110V. Armature resistance is 0.05Q and the shunt…

A: The answer as given below:

Q: How does a generator play a crucial role in a power generation system?

A: A generator plays a crucial role in a power generation system as it is the device responsible for…

Q: A long shunt compound generator delivers a current of 10A at 200V and has a series field resistance…

A: Rsh = 200 Rse = 1 ohm Ia = 10 A

Q: A 250 V d.c. shunt generator has 1250 watts constant loss. Find out load current at maximum…

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Q: 5. Two 50 MVA, 3-phase alternators operate in parallel. The settings of governors are such that the…

A:

Q: 6. The O.C.C. of a shunt generator when separately-excited and running at 1000 r.p.m. is given by :…

A: 6. The Open circuit characteristics of a shunt generator when separately-excited and running at 1000…

Q: Example 2: a 3-phase SM its armature resistance is 0.50 and syn. Reactance is 0.86692/phase. The…

A:

Q: A 35-ohm diverter resistance is shunted across the series field of a DC series generator is…

A: The field windings, armature windings, and external load circuits are all linked in series in a DC…

Q: Is desirable to have leading power factor loads? Why? Please explain.

A: The phase difference between current and voltage in an electrical circuit is defined by the power…

Q: a- Compare the excitation of 3-phase induction and synchronous machines.

A: As per the policy, I can attempt only one individual question at a time. Compare the excitation of 3…

Q: A synchronous generator with a synchronous reactance of 1.15 p.u. is connected to an infinite bus…

A: Given data, Xs=1.15 puV=1.0 VXe=0.15 puPmax.=1.2 pu

Q: What is power factor correctoin?

A: Power factor correction:

Q: bla 5 In 2-pole machines: the wave winding have greater generated voltage than *.the lap winding…

A: DC machines induced emf  E= PZN×flux/(60A)  It's depend on no of parallel path and no of pole.  And…

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.